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From "Kevin Wilhelm" <KevinWilh...@gmx.net>
Subject 2 webapps using shared jar (ClassLoader problem)
Date Thu, 28 Jun 2007 12:34:51 GMT
I deployed a shared jar file on Tomcat that is to be used by two Spring webapps. The problem
is the Exception I receive when trying to access the shared library by the second webapp.
The first one already set some properties within the shared class instances.

The Exception:

java.lang.IllegalArgumentException: interface org.hibernate.jdbc.ConnectionWrapper is not
visible from class loader 
   java.lang.reflect.Proxy.getProxyClass(Proxy.java:353) 
   java.lang.reflect.Proxy.newProxyInstance(Proxy.java:581) 
   org.hibernate.jdbc.BorrowedConnectionProxy.generateProxy(BorrowedConnectionProxy.java:67)

   org.hibernate.jdbc.ConnectionManager.borrowConnection(ConnectionManager.java:163) 
   org.hibernate.jdbc.JDBCContext.borrowConnection(JDBCContext.java:111) 
   org.hibernate.impl.SessionImpl.connection(SessionImpl.java:359) 
   org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:456)

   org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:349)

   org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:259)

   org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:102)

   org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:161)

   org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:203)

   $Proxy2.create(Unknown Source) 
   test.TestController.handleRequest(TestController.java:39) 
   org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)

   org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:839)

   org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:774)

   org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:460)

   org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:415) 
   javax.servlet.http.HttpServlet.service(HttpServlet.java:690) 
   javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

The interface from Hibernate is in the hibernate3.jar file of the first webapp.

I tried to do something that seemed to be a workaround. Something to do with the ClassLoaders
not being able to see each others classes?! I extended Spring's ContextListeners and replaced
the original ones for startup (for both webapps):

public class MySpringContextListener extends org.spring....ContextLoaderListener {

	@Override
	public void contextInitialized(ServletContextEvent evt) {
		ClassLoader contextLoader = Thread.currentThread().getContextClassLoader(); 
		Thread.currentThread().setContextClassLoader(getClass().getClassLoader()); 
		super.contextInitialized(evt); 
		Thread.currentThread().setContextClassLoader(contextLoader);	
	}
	
	@Override
	public void contextDestroyed(ServletContextEvent evt) {
		
		ClassLoader contextLoader = Thread.currentThread().getContextClassLoader(); 
		Thread.currentThread().setContextClassLoader(getClass().getClassLoader()); 
		super.contextDestroyed(evt); 
		evt.getServletContext().removeAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);

		Thread.currentThread().setContextClassLoader(contextLoader);
	}
}

But the exception remains 

Can you help me, please?

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